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For college campuses, fairgrounds, amusement parks, and other
large areas with many obstacles and heavy foot traffic:
A tower tall enough to be seen from practically anywhere in the area
is erected. Atop this tower is a sphere covered with outward
pointing tubes. At the base of each tube (printed
on the sphere) is a
coordinate in the form of, e.g., 14J, with the numbers increasing
clockwise around the tower and the letters increasing with altitude.
Any point surrounding the tower can thus be described with a rough
degree of accuracy by the coordinates visible from that point. For
very large areas, multiple towers of different colors may be
necessary.
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